Javascript 图像加载 [英] Javascript Image onLoad

问题描述

为什么 onLoad 没有被触发?

Why does the onLoad not get triggered?

      function FULL_IMAGE(fimage){
        document.getElementById("FULL_SRC").onLoad = function(){
          offsetTop = document.getElementById("FULL_SRC").height / 2;
          offsetLeft = document.getElementById("FULL_SRC").width / 2;
          document.getElementById("FULL_SRC").style.marginTop="-"+offsetTop+"px";
          document.getElementById("FULL_SRC").style.marginLeft="-"+offsetLeft+"px";
        }
        document.getElementById("FULL_SRC").src=fimage;
        document.getElementById("FULL_VIEW").style.display="block";
      }

推荐答案

有时从浏览器缓存中检索图像时，不会触发 onload 事件，因此您可能会做一些小技巧:

sometimes when image is retrieved from browser cache, onload event would not be fired, thus you may do a little hack:

function FULL_IMAGE(fimage) {
    var loaded = false;
    function loadHandler() {
        if (loaded) {
            return;
        }
        loaded = true;
        /* your code */
    }
    var img = document.getElementById('FULL_SRC');
    img.addEventListener('load', loadHandler);
    img.src = fimage;
    img.style.display = 'block';
    if (img.complete) {
        loadHandler();
    }
}

这篇关于Javascript 图像加载的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！